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m = -4
Rumus Mencari Persamaan Garis :
y - y1 = m (x - x1)
y - (-2) = -4 (x - 5)
y + 2 = -4x + 20
y = -4x + 20 - 2
y = -4x + 18 Atau -4x - y + 18 = 0